201 research outputs found
Fluidity Onset in Graphene
Viscous electron fluids have emerged recently as a new paradigm of
strongly-correlated electron transport in solids. Here we report on a direct
observation of the transition to this long-sought-for state of matter in a
high-mobility electron system in graphene. Unexpectedly, the electron flow is
found to be interaction-dominated but non-hydrodynamic (quasiballistic) in a
wide temperature range, showing signatures of viscous flows only at relatively
high temperatures. The transition between the two regimes is characterized by a
sharp maximum of negative resistance, probed in proximity to the current
injector. The resistance decreases as the system goes deeper into the
hydrodynamic regime. In a perfect darkness-before-daybreak manner, the
interaction-dominated negative response is strongest at the transition to the
quasiballistic regime. Our work provides the first demonstration of how the
viscous fluid behavior emerges in an interacting electron system.Comment: 8pgs, 4fg
Development of a 2-Dimensional Video-Acoustic Tool for Monitoring Bite Placement
Studies of grazing behaviour conducted at the spatial scale of a feeding station demonstrate that intake rate declines with increasing depletion, a response attributed to an increase in bite overlap (Ginnett et al., 1999; Ungar et al., 2001). In order to understand the rules that govern bite placement, a methodology is required that can map the sequential placement of bites on the sward surface. We developed a video-acoustic tool to achieve this and report the findings of using the tool on small uniform patches of herbage
Stimuli-responsive 2D polyelectrolyte photonic crystals for optically encoded pH sensing.
A versatile photonic crystal sensing motif based on a twodimensional (2D) inverse opal monolayer of stimuli-responsive polyelectrolyte gel with tunable optical properties is reported. The photonic membrane shows prompt response to pH and can be readily
read out from either its optical spectra or interference colours
Circular Dichroism Enhancement in Plasmonic Nanorod Metamaterials
Optical activity is a fundamental phenomenon originating from the chiral
nature of crystals and molecules. While intrinsic chiroptical responses of
ordinary chiral materials to circularly polarized light are relatively weak,
they can be enhanced by specially tailored nanostructures. Here, nanorod
metamaterials, comprising a dense array of vertically aligned gold nanorods, is
shown to provide significant enhancement of the circular dichroism response of
an embedded material. A nanorod composite, acting as an artificial uniaxial
crystal, is filled with chiral mercury sulfide nanocrystals embedded in a
transparent polymer. The nanorod based metamaterial, being inherently achiral,
enables optical activity enhancement or suppression. Unique properties of
inherently achiral structures to tailor optical activities pave a way for
flexible characterization of optical activity of molecules and
nanocrystal-based compounds
Circular dichroism enhancement in plasmonic nanorod metamaterials
Optical activity is a fundamental phenomenon originating from the chiral nature of crystals and molecules. While intrinsic chiroptical responses of ordinary chiral materials to circularly polarized light are relatively weak, they can be enhanced by specially tailored nanostructures. Here, nanorod metamaterials, comprising a dense array of vertically aligned gold nanorods, is shown to provide a significant enhancement of the circular dichroism response of an embedded material. A nanorod composite, acting as an artificial uniaxial crystal, is filled with chiral mercury sulfide nanocrystals embedded in a transparent polymer. The metamaterial, being inherently achiral, enables optical activity enhancement or suppression. Unique properties of inherently achiral structures to tailor optical activities pave a way for flexible characterization of optical activity of molecules and nanocrystal-based compounds.EPSRC (UK); ERC iPLASMM (321268); TAU Rector grant; PAZY foundation; German-Israeli
Foundation (2399); Israel Sciecnce Foundataion (507/14); Russian Foundation for Basic Research
(16-52-00112); Russian Science Foundation (16-12-10287); Ministry of Education and Science
of Russian Federation (SP-4248.2016.1, 3.4982.2017/6.7); Royal Society; Wolfson Foundation
Critical behavior of a one-dimensional monomer-dimer reaction model with lateral interactions
A monomer-dimer reaction lattice model with lateral repulsion among the same
species is studied using a mean-field analysis and Monte Carlo simulations. For
weak repulsions, the model exhibits a first-order irreversible phase transition
between two absorbing states saturated by each different species. Increasing
the repulsion, a reactive stationary state appears in addition to the saturated
states. The irreversible phase transitions from the reactive phase to any of
the saturated states are continuous and belong to the directed percolation
universality class. However, a different critical behavior is found at the
point where the directed percolation phase boundaries meet. The values of the
critical exponents calculated at the bicritical point are in good agreement
with the exponents corresponding to the parity-conserving universality class.
Since the adsorption-reaction processes does not lead to a non-trivial local
parity-conserving dynamics, this result confirms that the twofold symmetry
between absorbing states plays a relevant role in determining the universality
class. The value of the exponent , which characterizes the
fluctuations of an interface at the bicritical point, supports the
Bassler-Brown's conjecture which states that this is a new exponent in the
parity-conserving universality class.Comment: 19 pages, 22 figures, to be published in Phys. Rev
Organisation and Governance of Urban Energy Systems:District Heating and Cooling in the UK
International audienc
The Effect of Adult Aggression on Habitat Selection by Settlers of Two Coral-Dwelling Damselfishes
Coral-reef fishes experience a major challenge when facing settlement in a multi-threat environment, within which, using settlement cues, they need to select a suitable site. Studies in laboratories and artificial setups have shown that the presence of conspecific adults often serves as a positive settlement cue, whose value is explained by the increased survival of juveniles in an already proven fit environment. However, settlement in already inhabited corals may expose the recruits to adult aggression. Daily observations and manipulation experiments were used in the present study, which was conducted in the natural reef. We revealed differential strategies of settlers, which do not necessarily join conspecific adults. Dascyllus aruanus prefer to settle near (not with) their aggressive adults, and to join them only after gaining in size; whereas Dascyllus marginatus settlers in densely populated reefs settle independently of their adult distribution. Our results present different solutions to the challenges faced by fish recruits while selecting their microhabitat, and emphasize the complexity of habitat selection by the naïve settlers. Although laboratory experiments are important to the understanding of fish habitat selection, further studies in natural habitats are essential in order to elucidate the actual patterns of settlement and habitat selection, which are crucial for the survival of coral-reef fish populations
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Interaction between a cationic surfactant-like peptide and lipid vesicles and its relationship to antimicrobial activity
We investigate the properties of an antimicrobial
surfactant-like peptide (Ala)6(Arg), A6R, containing a
cationic headgroup. The interaction of this peptide with
zwitterionic (DPPC) lipid vesicles is investigated using a range of microscopic, X-ray scattering, spectroscopic, and calorimetric methods. The β-sheet structure adopted by A6R is disrupted in the presence of DPPC. A strong effect on the
small-angle X-ray scattering profile is observed: the Bragg
peaks from the DPPC bilayers in the vesicle walls are
eliminated in the presence of A6R and only bilayer form factor peaks are observed. All of these observations point to the interaction of A6R with DPPC bilayers. These studies provide insight into interactions between a model cationic peptide and vesicles, relevant to understanding the action of antimicrobial peptides on lipid membranes. Notably, peptide A6R exhibits antimicrobial activity without membrane lysis
Epithelioid Angiosarcoma of the Small Intestine After Occupational Exposure to Radiation and Polyvinyl Chloride: A case Report and Review of Literature
Angiosarcomas represent 1–2% of soft tissue sarcomas and most frequently occur in the subcutis. They may affect internal
organs, such as the heart, liver, and spleen, and only rarely do they emerge in the gastrointestinal tract. The association
between angiosarcomas and certain toxic chemical substances or previous external-beam radiation therapy is well
documented
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